TPS3421: Marking code - doubts and check

Vittorio Loggia

Part Number: TPS3421

During production we realized that the last batch of this component has a slightly different marking than the previous one.

Also this version is not working well and is creating problems with the reset signal (two circle for pin 1).
If it is replaced with a previous component there are no problems, if it is replaced with a similar component the problems comes back.

is the marking correct? or are we facing incorrect components?

Below photos of the componets.

---> No work

---> Work

over 2 years ago

0 Ben C over 2 years ago

TI__Mastermind 27445 points

Hi Vittorio,

Can you provide more information?

1. Was the product purchased directly from TI? If not, was the product purchased from a TI authorized distributor?

2. Can you provide us the distributor name?

3. How long has this part been used in the application? Has something changed recently to the design?

4. Can a picture of the reel label be provided?

Thanks!

Ben

0 Ben C over 2 years ago in reply to Ben C

TI__Mastermind 27445 points

Hi Vittorio,

Are there any updates? We would like to help resolve your issue. Thanks!

Ben

0 Vittorio Loggia over 2 years ago in reply to Ben C

Prodigy 50 points

Hi,
I'm waiting replies from the distributor and our supplier that assembles electronic circuits.

0 Ben C over 2 years ago in reply to Vittorio Loggia

TI__Mastermind 27445 points

Hi Vittorio,

Thanks for the info. Please keep us updated! Providing us the information about the where the units were obtained can really really help us understand the issue that you are experiencing.

Ben

0 Ben C over 2 years ago in reply to Ben C

TI__Mastermind 27445 points

Bumping thread to the top.

Ben

+1 Vittorio Loggia over 2 years ago

Prodigy 50 points

Hi Ben,

mistery solved...
in the regularly purchased lot, there were some components bought from a broker.
I checked mark code "AC"... but probably these components are either damaged... p/n is correct.

once the right components were mounted the problem was gone.

the thing that amazes me is the extra circle on the top, I just hope they weren't fake.
sorry for the lost time and thanks for the support

0 Ben C over 2 years ago in reply to Vittorio Loggia

TI__Mastermind 27445 points

Hi Vittorio,

I am very happy that the problem was solved! No worries for the lost time! We are here to support our customers! :-)

Good luck to you!

Ben

0 Ben C over 2 years ago in reply to Ben C

TI__Mastermind 27445 points

Hi Vittorio,

Our Quality and Reliability group has reviewed the pictures and has commented. See below for their comment:

"We have confirmed with our Assembly & Test site for this device TPS3421 that there should only be one Pin 1 dot. As such, if the customer purchased the units with two Pin 1 dots from a non-authorized TI Distributor, it is highly that those units are counterfeit material."

I hope this brings more clarity to your situation.

Ben

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TPS3421: Marking code - doubts and check